Aminoacid sequence analysis of the virion-associated protein gp18 from phi-IPLA7. A) ClustalW alignment of the predicted binding site. Positions with a single, fully conserved residue are marked with an asterisk; the colon marks the conserved residues between groups of strongly similar properties, and the period marks the residues weakly conserved between groups based on the Gonnet PAM 250 matrix, score <0,5. Highlighted are those residues involved in ligand association. B) Predicted 3D structure of phi-IPLA7 gp18. C) Predicted 3D structure of the domain pectin lyase like (D1) (amino acids 316- 374).